Answer: It's not a good idea to reseed your lawn and then apply weed and feed - there are seed germination inhibitors in weed and feed products. I'd suggest aerating and reseeding now in early spring, which is one of the best times to reseed, and then waiting until the new grass is established before using an herbicide. The package will indicate how old your new lawn needs to be before it's safe to apply the weed and feed product.
Best wishes with your lawn!
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